Patent US3789286A successfully refreshed from Google Patents.
US3789286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control for stepper motors by torque transfer
Assignee: International Business Machines Corp
•
Filing: 1972-02-17
•
Granted: 1974-01-29
•
Expires: 1992-02-17
Abstract
Abstract A document transport includes a stepping motor drive for incrementally advancing documents through a read station. The stepper motor drive ejects the documents from the read station to a continuously running stacker transport which conveys the document to one of two stackers. The stacker transport by means of a belt and pulley drives a gear which meshes with a gear coupled to the stepper motor drive by a one-way clutch whereby if the stepper motor drive tries to run faster than the continuously running drive it picks up the load of the stacker transport and is forced to run at the speed thereof. The stepper motor drive is free to stop or increment at any desired speed but it cannot exceed the speed of the stacker transport without picking up the load thereof. The emitter lead angle of the stepper motor drive is set so that the stepping motor would run faster than the stacker transport but the constraint of the stacker transport via the mechanical phase lock forces the stepper motor to run at stacker transport speed and excess torque of the stepper motor is transferred to the stacker transport. In stepper motor drive systems not having a continuously running transport section, the control load can take the form of a synchronous or induction A.C. motor driven at a predetermined speed, i.e., the regulated speed.
Inventors
- 👤 D Towne
- 👤 M Zell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:02
CPC Classifications
G; G06; G06K; G06K13/00; G06K13/02; G06K13/07; G06K13/077
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
102 words
A mechanical speed control system for a stepper motor adapted to advance articles through a work station and having a predetermined torque capability comprising means for operating said stepper motor at a plurality of different speeds including a speed greater than a predetermined regulated speed, a control load greater than said torque capability of said stepper motor and constantly driven at said predetermined regulated speed, and, uni-directional coupling means for coupling said control load to said stepper motor to force the same to run at said regulated speed when said stepper motor is operated at said speed greater than said regulated speed.
Claim 2
Dependent Claim
102 words
A mechanical speed control system for a stepper motor adapted to advance articles through a work station and having a predetermined torque capability comprising means for operating said stepper motor at a plurality of different speeds including a speed greater than a predetermined regulated speed, a control load greater than said torque capability of said stepper motor and constantly driven at said predetermined regulated speed, and, uni-directional coupling means for coupling said control load to said stepper motor to force the same to run at said regulated speed when said stepper motor is operated at said speed greater than said regulated speed.
Claim 3
Dependent Claim
24 words
The mechanical speed control system of claim 1 wherein said means for coupling said control load to said stepper motor is a one-way clutch.
Claim 4
Dependent Claim
18 words
The mechanical speed control system of claim 1 wherein said control load is a constantly running A.C. motor.
Claim 5
Dependent Claim
17 words
The mechanical speed control system of claim 1 wherein said control load is a document stacker transport.
Claim 6
Dependent Claim
88 words
The mechanical speed control system of claim 1 wherein said means for operating said stepper motor at a speed greater than a predetermined regulated speed comprises an emitter connected to be driven by said stepper motor to provide a series of stepping pulses and having a lead angle set to run said stepper motor faster than said regulated speed, electrical drivers connected to said stepper motor and responsive to pulses from said emitter to enerGize said stepper motor and means for applying an advance pulse to said drivers.
Claim 7
Dependent Claim
85 words
A mechanical phase lock for document transports comprising a pair of transport sections, one of said sections being intermittently driven at predetermined speeds, the other being continuously driven at a predetermined speed, a unidirectional clutch for connecting said one transport section to drive said other transport section, and means for connecting a load to said other transport section greater than the torque capability of said one transport section and thereby prevent said one transport section from exceeding said predetermined speed of said other transport section.
Claim 8
Dependent Claim
85 words
A mechanical phase lock for document transports comprising a pair of transport sections, one of said sections being intermittently driven at predetermined speeds, the other being continuously driven at a predetermined speed, a unidirectional clutch for connecting said one transport section to drive said other transport section, and means for connecting a load to said other transport section greater than the torque capability of said one transport section and thereby prevent said one transport section from exceeding said predetermined speed of said other transport section.
Claim 9
Dependent Claim
58 words
The mechanical phase lock for document transports as in claim 6 wherein the highest predetermined speed of said one transport section is higher than the speed of said other transport section whereby the torque of said one transport section is increased as said one transport section is forced to run at the speed of said other transport section.
Claim 10
Dependent Claim
22 words
The mechanical phase lock for document transports as in claim 6 wherein said one transport section is driven by a stepping motor.
Claim 11
Dependent Claim
31 words
The mechanical phase lock for document transports as in claim 8 wherein said stepping motor drives an emitter having a predetermined lead angle for generating pulses for driving said stepping motor.
Claim 12
Dependent Claim
26 words
The mechanical phase lock for document transports as in claim 9 wherein said emitter leading angle is set to increase the torque of said stepping motor.
Claim 13
Dependent Claim
164 words
A mechanical phase lock and torque amplifier for document transports comprising a pair of transport sections, one of said sections being intermittently driven at predetermined speed, the other being driven continuously at a predetermined speed, a stepping motor connected to drive said one transport section at said predetermined speeds, an emitter mounted to be driven by said stepping motor and having a lead angle so as to generate pulses for driving said stepping motor, a motor for continuously driving said other transport section at a predetermined speed, a first driven member driven by said motor, means for connecting a load exceeding the torque capability of said stepper motor to said first driven member, a second driven member mounted to be driven by said first driven member, and a one way clutch for coupling said stepper motor to said second driven member to couple said stepper motor to said load so that said stepping motor is prevented from exceeding said predetermined speed of said motor.
Claim 14
Dependent Claim
164 words
A mechanical phase lock and torque amplifier for document transports comprising a pair of transport sections, one of said sections being intermittently driven at predetermined speed, the other being driven continuously at a predetermined speed, a stepping motor connected to drive said one transport section at said predetermined speeds, an emitter mounted to be driven by said stepping motor and having a lead angle so as to generate pulses for driving said stepping motor, a motor for continuously driving said other transport section at a predetermined speed, a first driven member driven by said motor, means for connecting a load exceeding the torque capability of said stepper motor to said first driven member, a second driven member mounted to be driven by said first driven member, and a one way clutch for coupling said stepper motor to said second driven member to couple said stepper motor to said load so that said stepping motor is prevented from exceeding said predetermined speed of said motor.
Claim 15
Dependent Claim
23 words
The mechanical phase lock and torque amplifier for document transports as in claim 11 wherein said first and second driven members are gears.
Claim 16
Dependent Claim
29 words
The mechanical phase lock and torque amplifier for document transports as in claim 11 wherein the emitter lead angle is set to increase the torque of said stepper motor.
References Cited (Backward Citations)
US2242409A
Cited
US2329110A
Cited
US2351508A
Cited
US2383360A
Cited
US3217863A
Cited
US3476996A
Cited
US3586953A
Cited
US3436073A
Cited
US3642271A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |